Fix iPhone Restarts Randomly: Causes and Steps

If your iPhone restarts randomly, start by updating iOS and your apps, checking available storage and battery condition, and removing any recently added accessory or app that coincides with the problem. If restarts continue, back up the phone and work through the checks below; a recurring restart can point to a battery, software, or hardware fault that needs service.

What a random restart can indicate

A restart is different from an app closing or the screen briefly going dark. If the Apple logo appears and the phone starts up again, iOS or the device has restarted. An occasional restart after an update is less concerning than repeated restarts during ordinary use, while charging, or at a consistent battery level.

Common possibilities include outdated or damaged software, insufficient free storage, a battery that cannot reliably supply power, or a hardware problem. A case or connected accessory may also contribute if it presses a button, causes unusual heat, or is faulty. The timing of a restart is useful evidence, but it does not identify the cause by itself.

Try these checks in order

Record the pattern. Note when the restart happens, the battery percentage, whether the iPhone is charging, and what was open. If it happens after using one app, check whether that app has an update and test whether the problem stops when you avoid it.
Disconnect accessories. Unplug chargers and other connected accessories, then remove the case temporarily. Check that the side and volume buttons are not stuck or being held down. Try a different, compatible charger and cable if the issue occurs while charging.
Check storage. Open Settings > General > iPhone Storage. If storage is nearly full, remove or offload items you do not need, such as downloaded videos or large apps. Keep enough free space for normal system operations and updates; there is no single free-space amount that guarantees a fix.
Update iOS and apps. Open Settings > General > Software Update to check for an available iOS update. Back up first, connect to power and Wi-Fi, and follow the on-screen instructions. To update apps, open the App Store and check for available updates. Menu wording can vary slightly by iOS version.
Check battery condition. Go to Settings > Battery > Battery Health & Charging, if that option is available on your model. Read any service or performance messages shown there. Battery health information is a clue, not a complete hardware diagnosis; a battery can have a problem even if a displayed percentage does not seem especially low.
Restart normally and observe. Use the standard shutdown and startup controls for your model, then see whether the issue returns. A forced restart is intended for a frozen or unresponsive phone, not as a routine repair. The button sequence varies by model, so follow Apple’s instructions for your specific iPhone rather than guessing.

Use the pattern to narrow the cause

If restarts began immediately after installing an app, updating iOS, or connecting an accessory, test that change first. Remove a recently installed app only if the timing strongly implicates it, and make sure any data stored only in that app is backed up before deleting it. If the phone restarts under different circumstances, avoid assuming that one app is responsible.

A restart during charging may involve the cable, adapter, charging port, battery, or heat. Check for visible damage and try a known-good compatible charging setup. Do not insert objects into the port or use a damaged charger. If the phone becomes unusually hot, disconnect it from power, stop using it, and let it cool in a safe place; do not try to cool it rapidly in a refrigerator or with water.

Repeated restarts at a similar battery percentage can be consistent with a battery that struggles to deliver power, but it is not proof. Likewise, a restart after an update does not automatically mean the update caused permanent damage. Look for a repeatable pattern and use the checks together.

Back up before deeper troubleshooting

Before erasing or restoring an iPhone, make a current backup. You can use iCloud through Settings and your Apple Account’s iCloud settings, or back up to a computer using the available Apple device-management tools. Confirm that the backup completed and that important photos, messages, and files are included or synced elsewhere. A backup made before the latest changes may not contain newer data.

If basic checks fail, resetting settings may help with a configuration problem without deleting personal media. Find the reset choices under Settings > General > Transfer or Reset iPhone > Reset; read the confirmation screen carefully, because different reset options have different effects. Resetting all settings is not the same as erasing all content, but it can remove preferences such as saved network settings.

Erasing and setting up the iPhone again is a more disruptive test. Do it only after checking the backup and understanding how to restore your data. If the phone continues to restart after a clean setup, that makes a hardware issue more plausible, though only a proper inspection can determine the cause.

When to contact Apple or a repair provider

Seek service if restarts continue after updates and basic checks, if the phone repeatedly fails to start, or if it has been dropped, exposed to liquid, or shows physical damage. Contact support promptly if the battery is swollen, the display or case is lifting, or the phone becomes dangerously hot. Stop charging or using a device with a swollen battery; do not press, puncture, or try to remove the battery yourself.

Before arranging service, back up the phone if it can be done safely, note the restart pattern, and check your coverage and service options with Apple or an authorized provider. A technician can inspect the battery and other hardware. Avoid opening the device or attempting an internal repair unless you are qualified and equipped to do so.

Frequently Asked Questions

Why does my iPhone keep restarting every few minutes?
Repeated restarts can result from a software fault, very low available storage, a failing battery, or hardware damage. Update iOS, check storage and battery messages, and arrange service if the cycle continues.

Can a full iPhone storage cause random restarts?
Very low free storage can interfere with normal operation and is worth checking, but it is not the only possible cause. Review iPhone Storage and remove unnecessary downloads or apps, then see whether the behavior changes.

Will updating iOS stop my iPhone from restarting?
It may resolve a software problem, but it cannot repair a faulty battery or damaged hardware. Back up the phone before updating and keep it connected to power and Wi-Fi during the process.

Should I factory reset an iPhone that keeps restarting?
Not as the first step. Back up first, try less disruptive checks, and consider erasing the phone only if you understand how to restore your data. Persistent restarts after a clean setup warrant professional diagnosis.

Is it normal for an iPhone to restart after an update?
A restart during installation is expected. If the phone keeps restarting well after the update has finished, check storage and battery condition and contact support if troubleshooting does not resolve it.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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